<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  <title>CSS练习</title>
  <style>
    .col{
      background-color:red;
      width: 100px;
      height:100px;
      float:left;
      display:inline-block;
      margin-left: 20px;
    }
    .row{
      　position: relative;
    }
    .con{
      display:flex ;
      position: absolute;
      top:80PX;
      left: 50%;
      transform: translate(-50%, -50%);
    }
  </style>
</head>
<body>
<div class='row'>
  <div class='con'>
    <div class="col">
      <span></span>
    </div>
    <div class="col">
      <span></span>
    </div>
    <div class="col">
      <span></span>
    </div>
    <div class="col">
      <span></span>
    </div>
    <div class="col">
      <span></span>
    </div>
    <div class="col">
      <span></span>
    </div>
    <div class="col">
      <span></span>
    </div>
    <div class="col">
      <span></span>
    </div>
  </div>
</div>

</body>
</html>